Discussion on: Why doesn't useState has a dependency array?

[Jakub T. Jankiewicz]

You define state inside the hook and return setValue and value from the hook, just like useState does you don't pass state to hook.

const useTimer = () => {
   const [count, setCount] = useState(0);
   function increment() {
     setCount(count+1);
   }
   function decrement() {
     setCount(count-1);
   }
   return {count, increment, decrement};
};

[Sumit Wadhwa]

yes I think you're right. a hook's state should not depend on its props. it should be private and it should expose functions that trigger hook's state change so that we have more control over hook's state. thanks.

[peerreynders]

In hooks props are often used for state initialization:

const useCounter = (initialCount = 0) => {
   const [count, setCount] = useState(initialCount);
   function increment() {
     setCount(count+1);
   }
   function decrement() {
     setCount(count-1);
   }
   return {count, increment, decrement};
};